How to realize the algorithm of Extent conversion TE viewing position of two-dimensional Map by C #

This article will explain in detail how to realize the Extent conversion TE viewing position algorithm of two-dimensional map in C#. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

In the development of the system, we sometimes encounter the function development of two-dimensional linkage, that is, when the two-dimensional map moves, the three-dimensional movement moves with the movement, the three-dimensional map moves, and the two-dimensional map also changes.

The perspective of two-dimensional map is an upright viewing direction from top to bottom, and three-dimensional map can constantly change the viewing direction, so, in the process of linkage, when two-dimensional controls three-dimensional, the three-dimensional perspective can only maintain an upright downward direction in order to be consistent with two-dimensional.

In the process of moving a two-dimensional map, the four-to-four coordinates of the map, namely XMax,XMin,YMax,YMin, can be obtained. According to this range, a rough range can be calculated in TE for map positioning.

The specific code implementation is as follows (C #):

/ / XMax,XMin,YMax,YMin is 4 coordinates

Double pcenterX = (XMax+XMin) / 2

Double pcenterY = (YMax + YMin) / 2

/ / calculate the horizontal distance of the map

Double pdistance = SGWorld.CoordServices.GetDistance (XMax, YMax, XMin,YMax)

/ / calculate the vertical viewing height according to the horizontal viewing distance and the viewing range of the TE

Double pviewHeight = pdistance / 2 / Math.Tan (Math.PI * SGWorld.Navigate.FieldOfView / 360)

/ / calculate the viewing position according to the center point and viewing height

Var newPos = SGWorld.Creator.CreatePosition (pcenterX, pcenterY, pviewHeight, AltitudeTypeCode.ATC_TERRAIN_ABSOLUTE, 0,-89, 0, 0)

/ / navigate to the new location

SGWorld61.Navigate.SetPosition (newPos)

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